Which of the following reactions is a redox reaction?
2AgNO3 + BaCl2 → 2AgCl + Ba(NO3)2
BaO2 + H2SO4 → BaSO4 + H2O2
P2O5 + 2H2O → H4P2O7
Cu + 2AgNO3 → 2Ag + Cu(NO3)2
For the redox reaction,
Zn (s) + Cu2+ (0.1M) → Zn2+ (1M) + Cu (s)
taking place in a cell, E is 1.10 V. Ecell for the cell will be
2.14 V
1.80 V
0.82 V
1.07 V
Which of the following occurs at anode?
Reduction
Oxidation
Both (a) and (b)
None of these
B.
Oxidation
After ionisation anion moves towards electrode such electrode is known as anode. Hence, these negative ions on loosing electrons get oxidised.
e.g. NaCl Na+ + Cl-
At cathode - Na+ + e- → Na
At anode - Cl- → Cl2 + e-
Volume of CO3 obtained by the complete decomposition of 9.85 g BaCO3 is
2.24 L
1.12 L
0.84 L
0.56 L
The reduction potential of three metallic ions X, Y and Z correspondingly are +0.52,-303 and -1.18 V. The sequence of reducing capacity of these metals will be
Y >Z >X
X >Y >Z
X >Z >Y
Z >X >Y
For the reaction . Which of the following is correct?
Mn2+ | CO2 | H+ | |
5 | 2 | 4 | 10 |
Mn+ | CO2 | H+ | |
2 | 5 | 10 | 16 |
Mn2+ | C2O | CO2 | H+ |
6 | 8 | 16 | 18 |
Mn2+ | C2O | CO2 | H+ |
10 | 12 | 24 | 12 |
Acidic K2Cr2O7 reacting with H2S2 the oxidation number of chromium is changed
from +3 to +6
from+6 to +3
from +6 to +2
remains unchanged